-362
step-by-step explanation:
(12)(4)+2(12)-34(12)+2(12)-3
\/ \/ \/ \/
48 + 24 - 408 + 24 - 3
\ / \ /
72 - 432 - 3 = -363
answer: 8 years
the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.
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